Kai had always been fascinated by Hunter x Hunter. He'd watched every episode, read every chapter, memorized every Nen ability. At twenty-five, working a soulless software engineering job in Manila, that fictional world was his only escape.
He had no family who understood. No friends who shared his passion. Just an apartment full of merchandise and a heart full of longing.
If only I could be reborn there, he thought one night, watching the rain streak down his window. If only I could start over.
He didn't mean it literally.
But the universe—or something else—answered anyway.
It happened on a stormy night, when he was driving home from work. He was exhausted and distracted, and he didn't see the red light until it was too late. He stepped on the brakes, but it was futile.
The truck hit him at 11:47 PM. He felt his ribs shatter, his skull crack, his consciousness fragment.
Then nothing.
Then everything.
Warmth. Pressure. A woman's scream—no, a cry of pain.
"It's a boy!"
Kai tried to open his eyes. The light was blinding. His body was wrong—too small, too weak, too new.
A man with silver hair and cold eyes loomed over him. Silva Zoldyck.
No. No, no, no.
Another cry. Another baby.
"He has a twin brother," a girl's voice said.
Kai turned his head—a monumental effort—and saw spiky white hair. Blue eyes, already open, already aware.
Killua.
I'm Killua's twin.
Terror and wonder crashed through him.
He hadn't just been reborn.
He'd been reborn into the most dangerous family in the Hunter x Hunter world.
And he had no idea if that was a dream come true or a nightmare beginning.
He met his other siblings soon after he was born.
Illumi was the eldest—tall, pale, with long black hair that framed a face that never smiled. His eyes were dark pits, empty of anything Kai could recognize as emotion.
He was a master of manipulation and disguise, able to change his appearance and control minds with nen needles.
Illumi took a keen interest in Kai's development.
Not because he cared. Because he saw potential—and potential, to Illumi, was something to be shaped, molded, controlled.
"How many ways can you kill a man with a single finger?" Illumi asked him once, when Kai was five.
"Twelve," Kai answered.
Illumi tilted his head. "I know seventeen. Would you like to learn?"
Kai learned.
He always learned.
Milluki was the second son—fat, lazy, with short brown hair and thick glasses. He spent most of his time locked in his room, surrounded by computers and video games.
Despite his appearance, he was a genius—technology, information, gadgets, weapons. He could build or hack anything.
He was also jealous. Bitter. Spiteful.
He hated Kai for being better than him.
"Prodigy," Milluki would sneer, blocking a hallway or tripping Kai with a wire. "Let's see how talented you are when the traps are real."
Kai never reported him. Not because he forgave Milluki—but because the traps were good practice.
Kalluto was the youngest—so young that Kai sometimes forgot he existed. He looked like a girl, with long black hair, red eyes, and a kimono he refused to trade for practical training clothes. He carried a paper fan that could shred flesh like scissors through paper.
Kalluto was quiet. Obedient. But Kai saw the cunning behind those red eyes, the ambition hiding beneath silence.
He admired Kai's strength.
He envied Kai's bond with Killua.
He followed them sometimes, lurking in shadows, watching, learning.
And then there was Zeno, their grandfather.
Old but impossibly powerful. Short white hair, a long beard, a suit and hat that made him look like a retired businessman rather than one of the deadliest men alive. He was a master of transmutation and emission—his dragon-shaped aura could fly, attack, and destroy with terrifying precision.
Zeno was wise. Experienced.
He was also strict. Demanding. Cold in a way that made Silva look almost warm.
"You have potential," Zeno told Kai when he was six. "But potential is worthless without discipline. Remember that."
Kai remembered.
He remembered everything.
Training had begun when they were four.
At first, it was simple things. Calisthenics. Basic strikes. Learning to fall without breaking bones. The Zoldycks didn't believe in gentle introductions.
By five, they were handling real weapons. Knives. Wires. Poisons. Their hands, still small and soft, learned to kill in a dozen different ways.
Now, at six, the training had intensified into something monstrous.
Both twins could kill a grown man with their bare hands. They could navigate the mansion's deadly halls blindfolded. They could endure electric shocks, poison injections, and sleep deprivation that would break adult soldiers.
Kai had lost count of the bones he'd broken. The scars he'd earned. The nights he'd spent locked in the isolation chamber, screaming into the dark until his voice gave out.
But he endured.
Because he knew something the rest of his family didn't.
He knew Nen existed.
He knew how it worked—the four major principles, the six types, the advanced techniques. His past life memories were a treasure map to power. He remembered Gon's Jajanken. Killua's Godspeed. Hisoka's Bungee Gum. All of it, stored in his brain like precious gems.
But knowing the map wasn't the same as walking the road.
In the manga, Gon had sensed Hisoka's bloodlust without any training. Killua had done the same with Illumi's needle. Maybe—just maybe—Kai could sense his own aura before anyone forced it open.
So every night, after the training ended and the lights went out, he sat in the dark and searched inward.
He focused on his breathing. His heartbeat. The strange, quiet space behind his eyes where he imagined aura might live.
He felt nothing.
Patience, he told himself. It took Gon years to learn Nen properly. I have time.
He didn't mention his search to anyone. Not Killua, who slept in the bed beside him. Not the trainers, who would report everything to Silva. Especially not his parents.
If the family discovered he was trying to awaken Nen naturally—without their permission, without their control—they'd accelerate his training into something even worse. Or worse still, they'd force-activate him early, shattering his aura nodes with brute force like Wing had done to Gon.
He'd read enough Hunter x Hunter to know what the Zoldycks did to children who showed too much promise too soon.
So he hid.
And he waited.
It happened on an ordinary night.
No special mission. No life-or-death crisis.
Just Kai, sitting cross-legged on his bed, Killua breathing softly in sleep beside him, the mansion silent except for the distant hum of security systems.
He closed his eyes.
Breathe in. Breathe out.
Search.
Listen.
For months, there had been nothing. Just darkness. Just silence. Just the frustrating, maddening absence of something he knew should be there.
But tonight—
Tonight, something flickered.
At first, he thought he'd imagined it. A warmth, no bigger than a candle flame, deep in his chest. Faint. Unstable. Easy to miss.
But it was there.
His eyes snapped open.
Killua hadn't stirred. The room hadn't changed. But Kai's heart was pounding so hard he could hear it in his ears.
Aura.
My aura.
He closed his eyes again, desperate to find the warmth, to hold onto it—
It was gone.
Vanished like smoke in wind.
Kai sat in the dark, trembling, and wanted to scream.
It was real. I know it was real.
But without proof, without consistency, he had nothing. Just a flicker. Just a maybe.
He didn't sleep that night.
And he didn't tell anyone.
For three weeks, Kai learned to find it faster. To hold onto it longer. To feel its shape and texture without opening his eyes.
He couldn't use it yet. Couldn't wrap it around his fist or enhance his body or any of the things he dreamed about. But he could feel it.
And that was enough.
For now.
It was late. Past midnight. Kai sat in his usual spot—cross-legged on the cold stone floor instead of the bed, because the floor helped him focus. His eyes were closed. His breathing was slow.
The campfire in his chest burned bright.
"Seven years old."
Kai's eyes flew open.
Zeno Zoldyck stood in the doorway, arms crossed, white beard glowing in the moonlight. His expression was unreadable.
"Grandfather—" Kai started.
"Natural awakening." Zeno stepped into the room, closing the door behind him with a soft click. "Without trauma. Without forced activation. Without any external trigger at all."
Kai's throat went dry. "I don't know what you're—"
"Don't lie to me, boy." Zeno's voice wasn't loud. It didn't need to be. The weight of his presence pressed down like a mountain.
"I've been watching you for months. The way you sit. The way you breathe. The way your aura flickers when you think no one is looking."
Months. He'd been hiding for months, and Zeno had known the entire time.
"Why didn't you tell Father?" Kai whispered.
Zeno was quiet for a long moment. When he spoke again, his voice was different. Not softer—Zeno Zoldyck didn't do soft—but... considering.
"Because Silva would have broken you," he said. "Forced activation. Aggressive training. No room to grow, only room to perform. He would have turned you into a weapon by age ten and discarded you by age twenty."
Kai said nothing.
"Natural awakening is rare," Zeno continued. "In the three hundred year history of the Zoldyck family, only four members have achieved it before the age of ten. Your father was one. I was another."
He stepped closer, his presence filling the small room.
"You have potential, Kai. Real potential. Not the brute-force killing potential Silva values—but something deeper. Something stranger."
Kai's mind raced. "What do you want from me?"
Zeno smiled. It wasn't a kind smile.
"I want to train you," he said. "Properly. The way the Zoldycks trained their heirs, before becoming merchants of death. I want to teach you Nen as an art, and a weapon."
"And in exchange?"
"You'll be separated from your brother. No contact. No visits. No messages." Zeno's eyes hardened. "Killua will continue his training with the other instructors. You'll come with me. You'll live in my wing of the mansion. You'll see no one except me until I decide you're ready."
Kai felt the words like physical blows. "That's not an exchange."
"Yes." Zeno didn't deny it. "But it's also the only way you survive this family. Silva will discover your awakening eventually. When he does, you want to be under my protection. Understood?"
Kai thought of Killua. His brother's laugh. Their whispered promises of escape.
*Flashback*
They were four years old, lying in bed after a brutal training session, when they first whispered it to each other.
"Kai," Killua said, his voice small in the dark.
"Do you ever think about... leaving?"
Kai turned his head. His brother's blue eyes glittered like stars.
"All the time," he admitted.
"I want to see the world," Killua said. "Not just the mountain. Not just the mansion. The world. With oceans and cities and people who aren't assassins."
"We'll go together," Kai said.
"Promise?"
"Promise."
They clasped hands beneath the blanket.
And in the darkness of the Zoldyck estate, two brothers made a vow.
They would escape someday.
They would become hunters someday.
They would find their own happiness someday.
No matter what it takes.
*End of flashback*
"Someday" had just become a lot harder.
"...Fine," Kai said.
Zeno nodded once. "Pack nothing. Sentiment is weakness."
He walked to the door, then paused.
"Oh, and Kai? Don't try to contact your brother. I'll know if you do. And the punishment won't be for you—it'll be for him."
The door closed.
Kai sat alone in the dark, the campfire in his chest guttering like a dying candle.
And for the first time since being reborn, he wondered if he'd made a terrible mistake.
A year had passed since Zeno took him.
A year of isolation and silence. A year of learning Nen in the cold, windowless chambers of his grandfather's wing.
The family called him a prodigy.
Kai knew better.
Yes, he learned faster than Killua—but only because he'd seen these techniques before. His adult memories gave him a blueprint. He knew what Ten felt like before he'd even mastered it. He understood Ren, Zetsu, and Hatsu in theory long before he could practice them.
Killua had to discover everything blind.
But those same memories were a weakness.
It happened on a Tuesday.
Silva had summoned him back to the main wing for a "proficiency assessment." Zeno had agreed reluctantly, his ancient eyes watching Kai with something between curiosity and warning.
"Don't embarrass me," was all his grandfather said before releasing him.
The drill was simple: infiltrate a mock estate, eliminate the target, return undetected. Standard fare for an eight-year-old Zoldyck.
Kai moved through the corridors like smoke. His Ten was steady now—not perfect, but strong enough to sense basic threats. His footfalls made no sound. His breathing was nearly silent.
He found the target in the east wing.
A woman holding a baby.
Kai stopped.
It's a drill, he told himself. It's not real. The baby is a prop. The woman is an actor.
But his hands wouldn't move.
His adult mind screamed innocent civilian. While his assassin training screamed kill.
The hesitation lasted three seconds—but kai felt like an eternity.
The woman looked up. Her eyes widened. She pressed a hidden alarm.
Too late.
Kai lunged—but she was already running, and screaming, triggering traps he hadn't accounted for.
The drill ended in chaos.
The target escaped.
Father didn't yell.
That was the worst part. If he'd yelled, Kai could have prepared himself. Braced for the pain.
Instead, his father simply looked at him with cold, disappointed eyes.
"You hesitated."
Kai said nothing. There was nothing to say.
"How many times have we trained you to eliminate emotion from the kill?"
"...Countless, Father."
"Countless." Silva repeated the word like it tasted bad. "And yet here you are. Eight years old. A prodigy, they call you. Natural Nen awakening. Zeno's personal student. And you hesitated over a drill."
Kai's jaw tightened. "The baby—"
"There was no baby. There was a target and an obstacle. The obstacle was irrelevant. The target escaped." Silva stepped closer, his massive frame blocking the light. "Do you understand what this means?"
Yes, Kai thought. It means you're going to hurt me.
"Three broken fingers," Silva said. "And one week in the isolation chamber. Perhaps solitude will remind you what you are."
He didn't ask if Kai understood. He didn't wait for a response.
He simply reached down, took Kai's left hand, and broke three fingers in quick succession.
Crack. Crack. Crack.
Kai didn't scream.
He'd learned not to scream.
The chamber was a small, windowless box buried beneath the mansion.
No light. No sound. No sensation except cold stone and his own heartbeat.
Kai sat in the dark, his broken fingers throbbing, and tried not to think.
The first day, he counted his breaths. Fifteen thousand, four hundred and twenty-two. Then he lost count.
The second day, he practiced Ten. His aura flickered weakly—the pain made concentration difficult—but he held on.
The third day, he thought about Killua.
Is he okay? Does he miss me? Does he even remember me?
The fourth day, he stopped thinking about anything at all.
The fifth day, the memories came.
Not his past life memories—those were distant now, faded like old photographs. No, these were Zoldyck memories. The first time he'd killed. The first time Silva had beaten him bloody. The first time he'd heard Killua cry.
I'm not better than him.
The thought surfaced like a drowning man gasping for air.
I'm just different.
He thought what he heard from Zeno about Killua's drill. Perfect. Flawless. No hesitation. Killua had killed his target without a second thought, because Killua had never been anything except an assassin.
Kai had been a software engineer. A fanboy. A lonely twenty-five-year-old who'd wished for a better life.
The sixth day, he made a decision.
He couldn't afford to hesitate again.
Not because Silva would punish him—but because hesitation would get Killua killed. If Kai failed a real mission, the Zoldycks wouldn't just hurt him. They'd use his brother as leverage. They'd make Killua pay for Kai's weakness.
I have to be better.
Not for Silva. Not for Zeno.
For him.
The seventh day, the door opened.
Zeno stood in the corridor, his expression unreadable.
"Come" his grandfather said.
Kai stood on shaking legs. His broken fingers had begun to heal—Zoldyck blood and nen accelerated recovery—but they still ached.
"Did I pass?" Kai asked, his voice hoarse from disuse.
Zeno studied him for a long moment.
"You survived," he said finally. "For a Zoldyck, that's the same thing."
He turned and walked away.
Kai followed.
He didn't look back at the chamber.
He didn't need to.
He'd carry it with him forever.
Back in Zeno's wing, Kai sat on his bed and stared at his hands.
His left hand was bandaged. Three fingers, still crooked, still healing.
I hesitated.
I can't hesitate again.
He closed his eyes and found the campfire in his chest. Still burning. Still steady. After seven days in the dark, it felt brighter than ever.
Nen won't save me from myself, he realized. Only I can do that.
He thought about Gon. The boy who never hesitated. The boy who charged forward without fear, without doubt, without looking back.
I'm not Gon.
I'm not Killua.
I'm just Kai.
And Kai has to figure out who he wants to be.
He opened his eyes.
The answer wasn't clear yet. But for the first time since being reborn, he understood the question.
His Nen within his chest began to burn brighter as thoughts began to clear.